Chemistry - Metallurgy Question with Solution | TestHub
To get pure metal from impure metals, there are many refining processes according to nature of metal. Select CORRECT option(s) regarding refining of metals.
Options:(select one or more)
Answer:
Solution:
(A) Incorrect: The electrolyte for lead (Pb) refining is a solution of lead fluorosilicate (PbSiF₆) and hydrofluorosilicic acid (H₂SiF₆), since PbSO₄ is insoluble.
(B) Correct: Tin (Sn) has a low melting point and can be easily refined using liquation, poling (to remove oxides), or electrolytic refining.
(C) Correct: Zone refining is based on fractional crystallization, where impurities preferentially stay in the molten zone, making it ideal for high-purity semiconductors like Si and Ge.
(D) Correct: Cast iron is prepared by melting pig iron along with scrap iron and coke in a cupola furnace using a hot air blast.
